No. As he says at the start, it's to allow both Doom and Doom 2 from menu without switching anything around, so most of that is creating a duplicate entry. The most straightforward way to play Doom2 would be to copy the doom2.wad into the wads directory and modify the configuration file to use the doom2 wad instead of doom. I recommend leafpad as an easy, basic editor -- invoke it from command line with the file name as a parameter to edit files not accessible to the Maemo file selector.

This is about the same level of technical expertise that would have been required back when doom came out, too.

I believe the necessary details are in OP. If you have any specific questions feel free to ask. To go into more detail i'd have to go read the OP myself so i guess i'll leave ball in your court.